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Magnetism and Electromagnetism

Magnetism and Electromagnetism
In the left hand rule, forefinger always represents

magnetic field
Voltage
current
direction of force on the conductor

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Magnetism and Electromagnetism
Which of the following is a vector quantity?

Magnetic field intensity
Flux density
Magnetic potential
Relalative permeability

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Magnetism and Electromagnetism
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be

10 N
0.1 N
100 N
0.01 N

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Magnetism and Electromagnetism
When the current through the coil of an electromagnet reverses, the

direction of the magnetic field reverses
direction of the magnetic field remains unchanged
magnetic field collapses
magnetic field expands

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Magnetism and Electromagnetism
What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?

8
4
12
6

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Magnetism and Electromagnetism
A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?

6338 N/Wb
63380 N/Wb
63.38 N/Wb
633.8 N/Wb

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MORE MCQ ON Magnetism and Electromagnetism

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